A coepoeation op pennsyl



C. L. PEIRCEJR. LAMP SUPPORTING TROLLEY STRUCTURE.

APPLICATION man OCT. 15, 1915.

1 1 95,262 Patented Aug. 22, 1916.

2 SHEETS-SHEET l.

C. L. PEIRCE, JR. LAMP SUPPORTING TROLLEY STRUCTURE.

I APPLICAT'ON FILED 0CT.15 19|5- 1,195,262. Patented Aug. 22, 1916.

2 SHEETS-SHEET 2.

MU! w? W m I I I M H IWE QM I WI l I CHARLES I. PEIRCE, JIL, OFPITTSBURGH, PENNSYLVANIA, ASSIGNOR OF ONE-HALF TO HUBBARD & C30,, OFPITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

LAMP-SUPPORTING-TROLLEY STRUCTURE.

Specification of Letters Patent.

Patented Aug. 22, 1916.

To all whom it may concern:

Be it known that I, CHARLES L. Pnmon, J12, a citizen of the UnitedStates, and a resident of Pittsburgh, in the county of Allegheny andState of Pennsylvania, have in vented certain new and usefulImprovements in Lamp-Supporting-Trolley Structures, of which thefollowing is a specifica tion. 7

My invention relates to trolley structures particularly adaptable forsupporting lamps for street lighting purposes, the object being toprovide improved construction and arrangement which will moreeffectively protect all the operating parts against weather.

My improved construction is clearly shown in the accompanying drawing inwhich Figure l is a side elevational view of the upper end of the poleand the lamp supporting structure mounted thereon. Fig. 2 is a plan Viewof the parts shown in Fig. 1. Fig. 3 is a sectional view on plane 33 ofFig. 2. Fig. 1 is a sectional view on plane t4= of Fig. 1. Fig. 5v is'aview of the outer end of the boom and lamp support with the boom end capremoved. Fig. 6 is a view of the inner end of the boom and trolleymechanism. Fig. 7 is an outer end view showing a modified form oftrolley.

The boom 10 resembles a barn door hanger beam, being of inverted U shapecross section with its inner edge sections turned inwardly and upwardlyto form the parallel rail sections 11 and 12 and the troughs l3 and 14:.-At its inner end the beam is cut away a distance from the end to leaveonly the part 15 of its inner wall for providing space for the insertionand manipulation of a bolt or lag screw 16 by means of which the boommay at its inner end be secured to a pole p.

The boom is held in horizontal position by a rod 17 which is secured tothe pole at its inner end by a bolt or screw 18 and which is secured atits outer end to the boom end by a bolt 19, and this bolt 19 may alsosecure, on the outer end of the boom, the cap 20 for closing the boomend. To prevent swing of the boom around the pole a brace 21 is securedthereto near the pole, and may be secured to the pole by a separate lagscrew or by the bolt 16 which holds the inner end of the boom to thepole.

Adjacent the pole and to the top of the boom is secured the insulatorsupporting cross arm 22 which as shown may be a length of channel ironprovided at its ends with insulator supporting thimbles 23 of anydesired construction.

The lamp supporting trolley comprises the body 24 in the form of a shortlength of channel iron whose width is such that the ends of its sides aand b may engage in the troughs l3 and 14 of the boom to use suchtroughs as a trackway so that the trolley may be slid back and forth onthe boom.

The top of the body 24 has the longitudinal slot 25 through whichextends the flattened head 26 of the cylindrical lamp supporting bar 27.The lower end of this bar is threaded to receive a suitable fixture 28for supporting the lamp 2' and the shade s. The bar 27 has preferablythe transverse slot 29 in which is secured at its center the outer crossarm 30 which may also be a short length of channel iron and provided atits ends with the usual receiving thimbles 31.

In practice the current conducting leads (not shown) extend from the topof the pole and are secured to the insulator on the cross arms 22 and 30in a well known manner. When the lamp is in service it is suspended fromthe outer end of the boom, but for the purposes of inspection, renewalor repair, it is desirable to shift the lamp to the inner end of theboom so that such inspection, renewal or repair may be accomplished bythe repair-man standing on the pole.

In order to facilitate shifting .of the trolley on the boom I provide arod 32 which may be of metal, wood, or other stiff material. At itsouter end the rod has the eye 33 looping through the hole in extendingthrough the head 26 just above the top of the trolley body 24, and suchengagement of the rod with this head serves to hold the lamp supportingbar 27 to the trolley body, there being sufficient freedom in thissuspension arrangement to permit the lamp structure to hang vertical.The rod extends through the boom to the inner end thereof where it canbe reachedwhen it is desired to pull in the trolley and lamp structures.In order to prevent accidental displacement of the trolley and lampafter it has been shifted to its outer service position, I provide meansfor locking the rod.

As shown, the inner end section 34: of the inner rail 12 is bentdownwardly to horizontal position and has the slot or hole 35therethrough and the inner end 32 of the rod 32 is deflected downwardlyat right angles and is inserted in the slot or hole 35 after the trolleyhas been pushed out to the boom end, and the lamp will then be anchoredin its service position and prevented from becoming displaced. When itis desired to pull the lamp in, the rod is lifted sufliciently to liftits end 32 out of the opening 35, and when such opening is in the formof a slot the bar can be shifted laterally to remove its end 32therefrom.

My improved structure described above has proven to be very desirableand efficient. By means of the stiff rod 32 the lamp supporting trolleycan be more positively and readily shifted back and forth, and can be imore securely anchored and locked in its service position. The lampsupporting trolley and the rod are always within the boom when the lampis in service position and they are thus fully protected against theweather, and with the cap 20 in place on the end of the boom it isimpossible for rain, sleet or snow to get to the inside. On ac count ofsuch adequate protection against the weather, lubricant can be appliedto the traclnvay so that the trolley will slide freely. The inverted Ushaped cross section also gives great strength and rigidity to the boomand lighter stock can be used.

Where the lamp structure to be supported is very heavy, the trolley,instead of sliding over the trackway, may be provided with wheels 36pivoted to the sides a and Z) and riding in the troughs 13 and 1st.

Having now described my invention, I claim:

1. In a lamp supporting structure the combination of a boom structurehaving a longitudinal trackway, a trolley for riding on said trackwayand h aving a slot, a lamp supporting member extending upwardly throughsaid slot and having an opening therethrough above the trolley, a rodprojecting at its outer end through said opening to thus secure the lampsupporting member to the trolley, said rod extending to the inner end ofsaid boom structure to be manipulated to effect shifting of the trolleyon the track.

2. In a trolley arm structure, the combination of a boom of invertedU-shaped cross section with its edge sections turned inwardly to form atrackway, a trolley in the form of a length of channel bar having theends of its limbs engaging said trackway to ride thereon, and a lampsupport eX- tending from said trolley downwardly through the trackway.

3. In a trolley arm structure, the combination of a boom of invertedU-shaped cross section with its edge sections turned inwardly to form atraekway, a length of channel bar riding with its limbs on said trackwayand forming a trolley, the top of said trolley having an opening, a lampsupporting hanger extending upwardly through said opening, a rod withinthe boom interlocked with said hanger to suspend it from the trolley,and means at the inner end of said boom for locking said rod to therebylock the trolley against displacement.

4. In a trolley arm structure, the combination of a boom having atrackway at its interior, a trolley slidable on said trackway, a lamphanger extending upwardly through said trolley and having an openingabove the trolley, a shifting rod looped at its outer end through saidopening to thereby secure the hanger to the trolley, and means forlocking the inner end of said rod to the boom to prevent displacement ofsaid trolley.

5. In a trolley arm structure, the combination of a hollow boom having atrackway at its interior, a trolley ridable on said traclrway, ashifting rod pivoted at its outer end to said trolley, and a lockingslot at the inner end of said boom for receiving the inner end of saidrod to lock the rod and thereby the trolley against displacement.

6. In a trolley arm structure, the combination of a boom having aninternal trackway, a trolley ridable on said trackway, a shifting rodpivoted at its outer end to the trolley and having its inner enddeflected, and a locking notch at the inner end of said boom forreceiving the deflected end of said rod to thereby lock the rod andtrolley against displacement.

7. In a trolley arm structure, the combination of a tubular boom open atits inner end and having an interior trackway, a trolley within the boomslidable on said trackway, and a rod in said boom connected at its outerend to the trolley and shiftable longitudinally through the boom and theopen inner end thereof whereby to efiect shift of the trolley on thetrackway.

In witness whereof, I hereunto subscribe my name this 11th day ofOctober, A. D.

CHARLES L. PEIRCE, JR. lVitnesses:

RICHARD M. KnRsoHNnR, A. R. RoBrrzEK.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C. r

